I like Sonic 1 and Sonic 2 more than Sonic 3/& Knuckles.
I’ve only ever played Colors and a bit Sonic 1 on mobile, lol.
The former had a killer soundtrack, though. I should give Unleashed a try, but I’ve never felt the drive since to actively go through the trouble of playing a Sonic game. Not my thing, I guess? I mean, I enjoyed Colors, but I guess not enough to seek out more.